normally when it comes to anything like that...with arrows,or gaskets,rings...any and all markings go UP,unless stated otherwise by the manufactuer.The fact that you have two different bikes that have the reed cage in different positions,should be safe to say that either way is fine.How does the one with the arrow pointing down run,and how does the one pointing up run....if there's no difference,it'll be fine.When I got my v-force2,it showed the "V-Force" tag installed on top/up....but because of clearance issues,it had to face the botton/down...I've been running it that way since just fine.
Let's see if anyone else has any input on this.
Foxx